Edward weston



. (No Model.)

B. WESTON.

INGANDESGENT LAMP HOLDER.

No. 340,400. Patented AprJ'ZO, 1886.

fittest. Inventor:

N. PETERS, Photo-Lithograph", w'nmn w 5.0

UNITED STATES EDWVARD WESTON, OF NEIVABK, NElV JERSEY, ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

INCANDESCENT- SPECIFICATION forming part of Letters Application filed November 5, 1885.

To all whom it may concern:

Be it known that I, EDWARD WnsToN, a subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex 5 and State of New Jersey, have invented certain new and useful Improvements in Incandescent-Lamp Holders, of which the following is aspecification, referencebeing had to the drawing accompanying and forming a part of IO the same. v

This invention is an improvement on the form of incandescent-lamp holder shown and described in Patent No. 320,030, dated June 16, 1885.

The holder referred to may be briefly dc scribed as follows: The lamp-globe has a cylindrical neck, upon which a metal cylinder is secured by a cement. A plug of insulating material is inserted in the open end of this cylinder and carries contact-terminals. This fits into a scket,in which are contact-springs that encounter the terminals on the insulatingplug. Some form of locking device is 'employed to hold the lamp in the socket and to a maintain good electrical contact. The plug in this case has nearly the same diameter as that of the cylinder in which it is inserted, so that it fits snugly within the same. I have found in practice that this is an objectionable feature, as the material of the plug is liable to expand or to contract under the influences of dampness and heat to which it is often exposed, so that on the one hand it is liable to expand the thin metal cylinder and prevent the same from entering the socket, or on the other hand to become loose in it and impair the contact. 7

My improvement consists in making this plug somewhat smaller than the interior of the cylinder, and securing it in place by turning over the edge of the cylinder and forcing it into a groove in the plug. I prefer to make the plug of hard wood saturated with an insulating material-such as paraffine or linseed- 5 oil-and I prefer the described means of securing it in the cylinder; but as to this feature there are certain modifications which I consider within the invention-that is, the edge of the cylinder may be turned in at cer- 5e tain points only instead of all round, or the LAMP HOLDER.

Patent No. 340,400, dated April 20, 1886.

Scriall\'0.181,897. (No model.)

flange which results from turning in the edge may be formed by a bead or groove in the side of the cylinder.

In the drawing, which represents a portion of a lamp and a holder partly in section, A is the lower portion of the lamp.

B is a metal tube or cylinder fitted over the lamp-neck, and secured thereto by plaster-ofparis or like cement.

O C are pins projecting from the sides of the cylinder.

Dis the socket, having a beaded rim, E, in which are notches (not shown in the drawing) to permit the pins to enter the head or flange when the cylinder is placed in the socket.

A cork or other plug, F, is inserted in the glass neck,and the wires are brought out along its sides and secured to the terminals on the plug G. This plug is of wood or other insulating material, and is of somewhat smaller diameter than the bore of the cylinder B. The plug is secured in place by turning over or crimping the edge of the cylinder until it en- I ters a groove in the plug. There are spring or other contacts within the socket, that bear on the terminals of the lamp when the latter is placed in the socket.

An expansion or contraction of the plug G under these circumstances does not materially or injuriously affect the cylinder, the strength of which is greatly increased by the flange, for on a swelling of the plug the flange enters deeper into the plug or takes up the expansion, while a contraction of the plug does not separate it from the flange.

Inasmuch as the main purpose of the part described as a plug is to form an insulatingsupport for the terminalsof the lamp, it is ob vious that its particular shape or form is largely immaterial. It is not necessarily solid nor of the form shown.

\Vhat I claim is- 1. The combination, with an incandescentlamp globe having a cylindrical neck, a metal cylinder secured to the neck, a plug of insu- 5 lating material of smaller diameter than the cylinder, secured to the same by a flange or crimped edge, and carrying contact-terminals, of a socket containing contacts adapted to unite with those on the plug, and means for seeming the lamp and socket together, as set a socket, means for securing the lamp in the forth. socket, and contact-terminals carried by the to 2. The combination, with an incandescentplug and socket, respectively, all as set forth. lamp globe having a cylindrical neck, anietal T cylinder secured to the neck, a plug of insu- I EDWARD WESTOL lating material smaller than the bore of the \Vitnesses:

cylinder, and having a groove into which the H. A. BEGKMEYER,

edge of the cylinder is turned or crimped, of RICHARD WM. BLOEMEKE. 

